Induced EMF and Current

Electromagnetic fields (EMF) exist in the world around us, from electricity in power lines to microwave ovens, and are a part of modern life. They are also the subject of much scientific interest, as they may affect physical matter. For example, EMF may alter the Hansonian virus used as part of the intercellular transport system in human cells. It is also possible that EMF could modify the Hansonian virus so that current screening methods would not detect it.

An electromagnet can induce the current or EMF in a conductor. The magnetic field of the electromagnet induces a current in the conductor. The induced current flow is the induced current or EMF.

What is an Electromagnetic Field?

An electromagnetic field is the flow of electrons generated by a source and through a conductor. The flow of electrons in a metal conductor generates an EMF. The EMF’s strength depends on the magnitude of the current, length of the path and material properties of the conductor. It is a vector field, meaning it has a direction and a magnitude. The strength of the electric field is measured in volts per metre (V/m). The larger the current, the longer the path and the more resistive the material, the greater the EMF.

What is Induced Current?

The induced current is the flow of electricity that occurs in a conductor due to the movement of electricity. The amperage determines the amount of current that passes through the conductor. The induced current is used to power electrical devices and is measured in milliamps (mA), microamps (μA) or amps (A).

History of Induced Current

Michael Faraday first discovered the phenomenon of induction in 1831. When he passed a current through a wire in a coil of wire, he noticed the second wire was also electrified. He found that when a changing magnetic field is passed through a coil, it causes a current to be induced in the coil.

Magnetic Induction

Induced current occurs when a conductor (usually a wire) carries an electric current. The magnetic fields associated with an electric current create a magnetic field around the wire. If a conductor is nearby, the magnetic field it makes can affect the conductor. This phenomenon is called magnetic induction.

Magnetic Flux

A quantity of magnetic field intensity is the number of magnetic field lines that pass through a given surface in a given time is known as magnetic flux. The magnetic field strength is the magnitude of this vector, measured in terms of the field’s magnetic flux. Induced magnetic flux is the flow of a magnetic field from one location to another. Various mechanisms can create it, such as passing an electric current via a coil formed of wire close to a permanent magnet. The changing magnetic field lines caused by the induced current flow produce a flow of magnetic flux that may be measured using a fluxmeter.

The symbol for Magnetic Flux

1. Depending on the context, magnetic flux is usually symbolised by the Greek letter Phi or the Phi suffix B depending on the context.
2. Magnetic flux is represented by the symbols Φ or ΦB.

The formula for Magnetic Flux

The following is the magnetic flux formula:

1. The magnetic flux is represented by the symbol ΦB.
2. The magnetic field is represented by the letter B.
3. The angle at which the field lines travel through the given surface area is denoted by the letter “A.”
4. Magnetic Flux Unit is an abbreviation for Magnetic Flux Unit.

When measuring magnetic flux, a flux metre is typically used.

The following are the units of magnetic flux in both SI and CGS:

• The Weber is the SI unit of magnetic flux (Wb).
• Volt-seconds are the fundamental measurement unit.
• Maxwell is the name of the CGS unit.

Magnetic Field Hole

The magnetic field causes charged particles to flow in a particular direction (i.e., along the magnetic field lines). This change in current is often generated using a simple circuit and some magnetic material. The size and shape of the area where the current has been induced are called the magnetic field hole.

Induced Electromotive Force

When a current is passed through a wire, a voltage is generated along the length of the wire. This voltage causes the current to flow in the opposite direction, resulting in an electric current known as an electromotive force (EMF). The EMF is responsible for causing current to flow through the wire, and it is the mechanism by which electric current is generated. An EMF can be generated in several ways, including the propulsion of a magnet through a circuit, movement of a current through a wire and electrons in a material. EMF is also known as the voltage that causes the current to flow through a circuit.

Faraday’s law

Faraday’s law of induction is a fundamental principle of electromagnetism that describes how a magnetic field interacts with an electric circuit to generate an electromotive force (EMF). It is the primary operating concept of transformers, inductors, and various electrical motors, generators, and solenoids.

Faraday’s tests established that the EMF generated by a change in magnetic flux is dependent on a small number of variables. To begin, EMF is proportional to the change in flux Δ. Second, EMF is greatest when the time interval Δt changes the least—that is, EMF is inversely proportional to Δt. Finally, if a coil has N turns, an EMF N times larger than that of a single-coil will be created, implying that EMF is exactly proportional to N. 

Conclusion

Let us quickly conclude and revise this article in short. We have studied that Induced current or electromagnetic field (EMF) is the flow of electrons or other charge carriers in a material caused by an applied voltage, resulting in a flow of electrons through a material. We learned that electromotive force is the voltage or electric potential between two points in a circuit which is a cause of current flow or electric current in a conductor. We also briefly discuss the magnetic field hole, magnetic flux and magnetic induction.